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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.io_context.post"></a><a class="link" href="post.html" title="io_context::post">io_context::post</a>
</h4></div></div></div>
<p>
          <a class="indexterm" name="asio.indexterm.io_context.post"></a> 
(Deprecated: Use <a class="link" href="../post.html" title="post"><code class="computeroutput"><span class="identifier">post</span></code></a>.) Request the <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput"><span class="identifier">io_context</span></code></a> to invoke the given
          handler and return immediately.
        </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="../LegacyCompletionHandler.html" title="Legacy completion handler requirements">LegacyCompletionHandler</a><span class="special">&gt;</span>
<a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <span class="identifier">post</span><span class="special">(</span>
    <span class="identifier">LegacyCompletionHandler</span> <span class="special">&amp;&amp;</span> <span class="identifier">handler</span><span class="special">);</span>
</pre>
<p>
          This function is used to ask the <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput"><span class="identifier">io_context</span></code></a> to execute the given
          handler, but without allowing the <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput"><span class="identifier">io_context</span></code></a> to call the handler
          from inside this function.
        </p>
<p>
          The <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput"><span class="identifier">io_context</span></code></a>
          guarantees that the handler will only be called in a thread in which the
          <code class="computeroutput"><span class="identifier">run</span><span class="special">()</span></code>,
          <code class="computeroutput"><span class="identifier">run_one</span><span class="special">()</span></code>,
          <code class="computeroutput"><span class="identifier">poll</span><span class="special">()</span></code>
          or <code class="computeroutput"><span class="identifier">poll_one</span><span class="special">()</span></code>
          member functions is currently being invoked.
        </p>
<h6>
<a name="asio.reference.io_context.post.h0"></a>
          <span><a name="asio.reference.io_context.post.parameters"></a></span><a class="link" href="post.html#asio.reference.io_context.post.parameters">Parameters</a>
        </h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">handler</span></dt>
<dd>
<p>
                The handler to be called. The <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput"><span class="identifier">io_context</span></code></a> will make a copy
                of the handler object as required. The function signature of the
                handler must be:
              </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">();</span>
</pre>
</dd>
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<h6>
<a name="asio.reference.io_context.post.h1"></a>
          <span><a name="asio.reference.io_context.post.remarks"></a></span><a class="link" href="post.html#asio.reference.io_context.post.remarks">Remarks</a>
        </h6>
<p>
          This function throws an exception only if:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
              the handler's <code class="computeroutput"><span class="identifier">asio_handler_allocate</span></code>
              function; or
            </li>
<li class="listitem">
              the handler's copy constructor
            </li>
</ul></div>
<p>
          throws an exception.
        </p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2022 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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